package org.smart4j.framework.util;


import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class PropsUtil {
	private static final Logger LOGGER=LoggerFactory.getLogger(PropsUtil.class);
	
	/**
	 * 加载属性文件
	 * @return
	 */
	public static Properties loadProps(String fileName){
		
		Properties props = null;
		InputStream is = null;
		
		try {
			is=Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
			if(is==null){
				throw new FileNotFoundException(fileName + "file not found");
			}
			props = new Properties();
			props.load(is);
		} catch (IOException e) {
			LOGGER.error("load Properties file failure",e);
		}finally{
			if(is!=null){
				try {
					is.close();
				} catch (IOException e) {
					LOGGER.error("close InputStream failure",e);
				}
			}
		}
		return props;
	}
	
	
	/**
	 * 获取字符类型属性 默认为空
	 * @param props
	 * @param key
	 * @return
	 */
	public static String getString(Properties props,String key){
		return getString(props,key,"");
	}


	/**
	 * 获取字符类型属性
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static String getString(Properties props, String key, String defaultValue) {
		
		String value = defaultValue;
		if(props.containsKey(key)){
			value = props.getProperty(key);
		}
		return value;
	}
	
	/**
	 *  获取数值型属性
	 * @param props
	 * @param key
	 * @return
	 */
	public static int getInt(Properties props, String key) {
		return getInt(props,key,0);
	}
	
	
	/**
	 * 获取数值型属性
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static int getInt(Properties props, String key, int defaultValue) {
		
		int value = defaultValue;
		if(props.containsKey(key)){
			value = CastUtil.castInt(props.getProperty(key));
		}
		return value;
	}
	
	
	/**
	 *  获取布尔型属性
	 * @param props
	 * @param key
	 * @return
	 */
	public static Boolean getBoolean(Properties props, String key) {
		return getBoolean(props,key,false);
	}
	
	
	/**
	 * 获取布尔型属性
	 * @param props
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	public static Boolean getBoolean(Properties props, String key, Boolean defaultValue) {
		
		Boolean value = defaultValue;
		if(props.containsKey(key)){
			value = CastUtil.castBoolean(props.getProperty(key));
		}
		return value;
	}
	
	
}
